Attachment for motor boats



March 9 1926. 1,576,237

J. W. DAWSON I ATTACHMENT FOR MOTOR BOATS Filed Dec. 4. 1924 A rrofius vs Patented Mar.v 9, 1 926.

' UNITED STATES 1,57 ,231. PATENT OFFICE.

308E?! w. DAWSON. ST. LOUIS. MISSOURI.

ATTACHMENT FOB MOTOR BOATS.

Application filed December 4, 1924. Serial Io. 75;,792.

To all whom it may concern;

Be it known that I,Josm n W. DAwsoN, a citizen of the United States'of America,

a resident of the cit of St.'Louis, in the State of Missouri, ave invented certainnew and useful", Improvements in Attachtion.

mentsfor Motor Boats, of which the followin is a full ,'.clear,- and exact description,

re erence, being had to the accompanying drawing, forming apart of this specifica- This invention relates to attachments for motor boats, "and particularly to a device which may be associated with a motor boat whereby said motor boat maybe operated at a very low rate of speed.

As is well known,.most motors of-thetype, used to propel row boatsandcanoes are capable of operating at a single rate of speed.

. This speed may, of course, be varied slightly by manipulating the fuel throttle of the motor, but there are no sPeed changing mechanisms-associa-ted with thesemotors as there are with other .types' of motors. It 1s often desirable, for instance in fishing with a.

' trollingj line where said line is drawn slowly through the water, to"operate the boat at a very low rate of speed, and the main object of the present invention is to a simple and inexpensive device wlnch may be attached to a boat and which will permit, of" said boat being operated at every low produce rateofspeed.1

Withzthe foregoing and other ob]ects-. 1n

view, the invention comprises the novel con-- struction, combination and arrangement of parts hereinafter more specifically descmbed and illustrated in the accompanying drawings, wherein is shown the preferred em bodiment of the invention- However, it' is Y tobe understoodthat the invention compres hends changes, variations and modifications which come within hereunto appended.

Fig. I'sa side lev the scope-of the claims ation of a motor ofthe outboard typ'ei'used topropel" row boats. and canoes, a fragmentofa boato'r canoebe ng associated withs'aid motor-and said motor the adjusting mechanismaof my, improved being equipped with my" improved attacht elevation and pajrtly inasection, showing attachment.

Fig. 11" is, a perspective ofmyeilnproved -atta'c'hn'ie.Ilt.I

Fig. IIIisa fragmentary view; partly in the particular motor illustrated will not be described in detail. All that need be known for the present purpose is that means is provided to impart rotary motion to the pro peller D associated with the boat.

The motor illustrated in Fig. I, like most motors of its type, is not provided with speed-changing mechanism whereby great changes in the speed at which the boat may be driven may be attained. On the other hand, the only way'in which changes in the speed of the boat may be attained with the motor illustrated is by regulating the flow of fuel to said motor. It is apparent that variance in the speed of the boat obtained in this manner would necessarily be very slight and that the motor could not be'throttled down sufliciently to cause the boat tomove at the slow speed necessary fortroll- With the foregoing in mind I have provided the motor illustrated in Fig. I with an attachment which comprises a supporting element E composed of a pair of plates land 2. The plates 1 and 2 are provided with semicircular openings and have semicircular flanges 3 and 4 arranged adjacent to said semicircular openings, as shown clearly in Fig. II. The plates 1 and ,2, are

also provided with integrally formed lugs 5 and 'G-through which clamping devices 7, preferablv in the form of screws. are

passed to clamp said plates 1 and 2 to;

gethen. By referring to-Fig. I it will be seen' that'the plates 1 and 2-a-re associated with the standard S of the motor C in-suching a complete-annular flange when they are manner that the semicircular flanges 3 and 4 on said plates 1' and 2 embrace said'- standard S; said semicircular flanges form-1 6 associated 'witheach other which annular flange samunas said standardgand said clampingscrews- 7. It is plain the "semicircular'flanges being dr info l ona Contact h aid standard-by the-1 10 foregoing that when the plates 1 and 2 are secured togetherabout the standard S in the I I roof.-

manner described, the supporting element E is very firmly secured to said standard.

8 designates a plate which is hingedly secured to the supporting element E, said plate being provided with a pair of extensions 9, each of which supports an inwardly extending pivot pin 10. Formed al: the outer end of the plate 1 is a pair of members 11, circular in cross section, each of which is provided with an angularly arranged recess 12 into which the pivot pins 10 of the plate 8 are extended. It will be seen by referring to Fig. III that the recesses 12 are closed at their lowermost ends and open at their upper ends, and that said recesses incline downwardly from their open upper ends. that when the pivot pins 10 are extended into the recesses 12 the plate 8 will be pivotally go supported by the supporting element E, it

at which is formed a plurality of apertures 14,

and formed integral with the plate 8 is an internally threaded lug 15 through which a screw 16 passes. As will be seen by re ferring to the drawing, the screw 16 is capable of being adjusted toward and away from the curved face of the portion 13 and Fig. III shows that the screw 16 is provided with a reduced inner end portion which may be extended to any one of the apertures 14. The plate 8 is provided with a cutout portion 17 into which the portion 13 on the plate 1 extends, and it is apparent, in view of this, that said plate 8 may swing relative to the supporting element E. It is likewise plain that the plate 8 may be maintained in various positions relative to the supporting element E by causing the reduced end portion of the screw 16 to be extended into the various apertures 14.

The plate 1 is provided with a rib 18' and the plate 8 with ribs 19 and 20 to give the required rigidity to said plates.

In the use of my improved device the plate 8 is arranged adjacent to the propeller D of the boat. Theplate 8 is hingedly supported by the supporting element E, as already explained, and it may be moved toward and away from the propeller so that more or less surfaceof said plate may be exposed to the body of water which is being cast reawardly by the propeller. The positioning of the plate 8 adjacent to the propeller has the efi'ect of retarding the speed of the boat, for the reason that the body of water being cast rearwardly strikes the It is plain from thisplate 8 and therefore tends to interfere with the forward movement of said plate, and because said plate is secured to the boat the speed of said boat is thereby decreased. Also, the plate 8 acts as a drag in the water, and this interferes with the progress of the boat. It is apparent that by exposing more or less of the surface of the plate 8 to the body of water being cast rearwardly by the propeller, the speed of the boat may be regulated.

When desired the plate 8 may be entirely removed frofmthe supporting element E by simply unscrewing the screw 16 and withdrawing the pivot pins 10 from the recesses 12.

I claim:

1. An attachment for a motor boat, comprising a pivotedplate arranged immediately behind and extended transversely of the propeller of the motor boat, said plate being hinged at the top to permit the lower end thereof to swing upwardly and downwardly, and means comprising an adjusting screw whereby the position of said plate with respect to said propeller may be regulated.

2. An attachment for a motor boat, comprising a plate arranged in close proximity to the propeller of the boat, a supporting element above said propeller by means of which said plate is pivotally supported, and means whereby the position of said plate may be regulated, said means comprising a portion on said supporting element rovided witha plurality of apertures, an an adjustable member on said plate adapted to be moved into and out of the various apertures.

3. .An attachment for a motor boat, comprising a plate arranged in close proximity to the propeller of the motor boat, a supporting element above said propeller by means of which said plate is pivotally supported, and means whereby the position of said plate may be regulated,vsaid means comprising a portion on said supporting element rovided with a plurality of apertures an an adjusting screw supported by said plate and adapted to be moved into and out of various apertures.

4. An attachment fora boat provided with a motor having a standard, comprising a plate arranged immediately behind and extended transversely of the pro boat, a supporting element a apted to be clamped to said standard, said plate being pivotally attached to said supporting element in a manner .to permit the lower end thereof to swing upwardly and downwardly, and means whereby the position of said plate with respect to said propeller may be regulated. l

5. An attachment for a boat provided with a motor having a standard, comprising a plate arranged in close proximity to the propeller of the boat, a supporting element ller of the formed of a plurality of parts adapted to lated, said means comprising a portion (in 10 be clamped together to secure said supportsaid supportin element provided with aper- -ing element to said standard, said supporttures,and an a justing screw associated with ing element being provided with recesses said plate adapted to be extended into variinto which pivot pins associated with said ous apertures to maintain. said plate in plate extend whereby said plate is pivotally diflferent positions. 16 supported by said supporting element, and In testimony that I claim the foregoing means whereby the position'of said plate I hereunto afiix my signature.

with respect to said propeller may be regu- JOSEPH 'W. DAWSON. 

